* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
a {
  text-decoration: none;
}
ul,
ol {
  list-style: none;
}
.clearfix::after {
  content: '';
  display: block;
  clear: both;
}
.fl {
  float: left;
}
.fr {
  float: right;
}

.container {
  width: 100%;
  height: 500px;
  position: relative;
}

.container .topbar {
  width: 100%;
  height: 15%;
  background-color: rgba(255, 255, 255, 0.4);
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
}

.container .imgarea {
  width: 80%;
  height: 100%;
  margin: 0 auto;
  position: relative;
  background-color: rgb(60, 60, 206);
}

.container .imgarea > a {
  background-repeat: no-repeat;
  background-position: center 0;
  height: 100%;
  display: block;
  background-color: rgb(25, 117, 180);
  background-image: url('https://puui.qpic.cn/media_img/lena/PICgthm4a_580_1680/0');
}
